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# I could use some help with my calculations.

OK, first off I'd like to say hello to everyone. I have floated around the site for a while and finally decided to join the community. I managed to pick up a 200lb propane tank that someone started to build so far it had the door cut and hinges welded. I used feldon calculator the firebox I made so far is 19"x19"x19" Based on a 24" diameter x 33" long tank. I tried using the circle calc to get the fb/cc opening I'm getting a segment height of 3.5, a 4.5 under RF plare and a chord ab of 29.874 does this seem correct? Here is the link to the feldon calculator numbers. http://www.feldoncentral.com/bbqcalculator.html

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Based on a 24" diameter x 33" long tank.

That come out to a 65 gallon tank.... take a picture of it... and maybe re measure the tank..
I re measured before I went to work diameter is 24" longest point inside the tank is 33" right in the middle

15000 x 0.017 = 255 c,i, stack volume = 3" x 36" above the CC or 4" x 21" stack
15000 x 0.001 = 150 Sq In FB air inlets ... I recommend an air inlet directly across from the FB/CC opening of 4-6 sq. in.
15000 x 0.004 = 60 Sq In. FB/CC opening
and area under the RF plate
That translates to a 5" high cut out (ED) on a 12" radius....
And the RF plate (Chord AB) 19.5" wide

The calculator I used is one I adjusted using Feldon's original calculator to account for the problem when making a RF smoker...

Here are the details... and the circle calculator... http://www.1728.org/circsect.htm

...click on pics to enlarge....
Thank you Dave. I will get to work tonight when i get home. I have not given much thought as to what type or air vents i will use any suggestions.
About air vents... what ever you are comfortable with... Spring loaded pie vents, sliding gates.... as long as they are positioned correctly, on the Firebox.... you are good to go...
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